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How much longer can they (world governments) keep the lid from blowing straight off?

The rial's losses have accelerated in the past week after the government launched an "exchange centre" designed to supply dollars to importers of some basic goods at a special rate slightly cheaper than the market rate.

Instead of allaying fears about the availability of dollars, the centre seems to have intensified the race for hard currency by linking the special rate to the market rate, meaning that even privileged importers will face sharply higher costs.

"The government's initiative ... brought to the surface a tremendous lack of confidence in its ability to manage the currency," said Cliff Kupchan, a Middle East expert at the Eurasia Group, a political risk research firm. "The attempt to fix it triggered a worse crisis via market psychology."

http://www.zerohedge.com/news/2012-10-01/iran-rial-implodes-20-one-day-follow-death-currency-real-time